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Merge pull request #54 in DNS/adguard-dns from feature/348 to master

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* commit 'a15f21ca1cd0acabf77a4e9750dd77b2b870a6f4':
  code review -- move constants into named constants
  coredns plugin -- Cache /querylog API result
  coredns plugin -- Final fix for deadlock during coredns reload
  coredns plugin -- change rlock to lock when loading top stats to avoid doing it in parallel
  coredns plugin -- Fix deadlock during coredns reload
  stats -- Clamp number of rotations to sane value and prevent from going into (very long) loop
  querylog API -- when manually generating json, don't forget to escape strings
  coredns plugin -- don't reload from querylog on SIGUSR, we already have it in memory
  Fix some lint warnings
  coredns plugin -- Calculate top for domains, clients and blocked both from querylog and running requests.
  Fix more race conditions found by race detector
  Querylog -- Omit empty fields when writing json
  Querylog -- Read from querylog files when answering to /querylog API, it now survives restarts.
  querylog -- Add querylog files to gitignore
  if coredns unexpectedly quits, restart it
  Fix race conditions found by go's race detector
  Querylog -- Implement file writing and update /querylog handler for changed structures.
This commit is contained in:
Eugene Bujak 2018-10-08 20:15:06 +03:00
commit 16b1a343a0
10 changed files with 862 additions and 236 deletions
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2
.gitignore vendored
View file

@ -5,3 +5,5 @@
/coredns
/Corefile
/dnsfilter.txt
/querylog.json.gz
/querylog.json.gz.1

2
config.go
View file

@ -27,7 +27,7 @@ type configuration struct {
Filters []filter `yaml:"filters"`
UserRules []string `yaml:"user_rules"`
sync.Mutex `yaml:"-"`
sync.RWMutex `yaml:"-"`
}
type coreDNSConfig struct {

107
control.go
View file

@ -142,9 +142,14 @@ func handleStart(w http.ResponseWriter, r *http.Request) {
func childwaiter() {
err := coreDNSCommand.Wait()
log.Printf("coredns terminated: %s\n", err)
err = coreDNSCommand.Process.Release()
log.Printf("coredns released: %s\n", err)
log.Printf("coredns unexpectedly died: %s\n", err)
coreDNSCommand.Process.Release()
log.Printf("restarting coredns")
err = startDNSServer()
if err != nil {
log.Printf("Couldn't restart DNS server: %s\n", err)
return
}
}
func handleStop(w http.ResponseWriter, r *http.Request) {
@ -412,9 +417,9 @@ func handleStatsReset(w http.ResponseWriter, r *http.Request) {
}
func handleStatsTop(w http.ResponseWriter, r *http.Request) {
resp, err := client.Get("http://127.0.0.1:8618/querylog")
resp, err := client.Get("http://127.0.0.1:8618/stats_top")
if err != nil {
errortext := fmt.Sprintf("Couldn't get querylog from coredns: %T %s\n", err, err)
errortext := fmt.Sprintf("Couldn't get stats_top from coredns: %T %s\n", err, err)
log.Println(errortext)
http.Error(w, errortext, http.StatusBadGateway)
return
@ -423,7 +428,7 @@ func handleStatsTop(w http.ResponseWriter, r *http.Request) {
defer resp.Body.Close()
}
// read body
// read the body entirely
body, err := ioutil.ReadAll(resp.Body)
if err != nil {
errortext := fmt.Sprintf("Couldn't read response body: %s", err)
@ -431,85 +436,12 @@ func handleStatsTop(w http.ResponseWriter, r *http.Request) {
http.Error(w, errortext, http.StatusBadGateway)
return
}
// empty body
if len(body) == 0 {
return
}
values := []interface{}{}
err = json.Unmarshal(body, &values)
if err != nil {
errortext := fmt.Sprintf("Couldn't parse response body: %s", err)
log.Println(errortext)
http.Error(w, errortext, http.StatusBadGateway)
return
}
domains := map[string]int{}
blocked := map[string]int{}
clients := map[string]int{}
now := time.Now()
timeWindow := time.Hour * 24
notBefore := now.Add(timeWindow * -1)
for _, value := range values {
entry, ok := value.(map[string]interface{})
if !ok {
// ignore anything else
continue
}
host := getHost(entry)
reason := getReason(entry)
client := getClient(entry)
time := getTime(entry)
if time.Before(notBefore) {
// skip if the entry is before specified cutoff
continue
}
if len(host) > 0 {
domains[host]++
}
if len(host) > 0 && strings.HasPrefix(reason, "Filtered") {
blocked[host]++
}
if len(client) > 0 {
clients[client]++
}
}
// use manual json marshalling because we want maps to be sorted by value
json := bytes.Buffer{}
json.WriteString("{\n")
gen := func(json *bytes.Buffer, name string, top map[string]int, addComma bool) {
json.WriteString(" \"")
json.WriteString(name)
json.WriteString("\": {\n")
sorted := sortByValue(top)
for i, key := range sorted {
json.WriteString(" \"")
json.WriteString(key)
json.WriteString("\": ")
json.WriteString(strconv.Itoa(top[key]))
if i+1 != len(sorted) {
json.WriteByte(',')
}
json.WriteByte('\n')
}
json.WriteString(" }")
if addComma {
json.WriteByte(',')
}
json.WriteByte('\n')
}
gen(&json, "top_queried_domains", domains, true)
gen(&json, "top_blocked_domains", blocked, true)
gen(&json, "top_clients", clients, true)
json.WriteString(" \"stats_period\": \"24 hours\"\n")
json.WriteString("}\n")
// forward body entirely with status code
w.Header().Set("Content-Type", "application/json")
_, err = w.Write(json.Bytes())
w.Header().Set("Content-Length", strconv.Itoa(len(body)))
w.WriteHeader(resp.StatusCode)
_, err = w.Write(body)
if err != nil {
errortext := fmt.Sprintf("Couldn't write body: %s", err)
log.Println(errortext)
@ -578,7 +510,7 @@ func handleTestUpstreamDNS(w http.ResponseWriter, r *http.Request) {
result := map[string]string{}
for _, host := range hosts {
err := checkDNS(host)
err = checkDNS(host)
if err != nil {
log.Println(err)
result[host] = err.Error()
@ -789,10 +721,11 @@ func handleFilteringStatus(w http.ResponseWriter, r *http.Request) {
"enabled": config.CoreDNS.FilteringEnabled,
}
config.RLock()
data["filters"] = config.Filters
data["user_rules"] = config.UserRules
json, err := json.Marshal(data)
config.RUnlock()
if err != nil {
errortext := fmt.Sprintf("Unable to marshal status json: %s", err)
@ -1122,7 +1055,6 @@ func runFilterRefreshers() {
func refreshFiltersIfNeccessary() int {
now := time.Now()
config.Lock()
defer config.Unlock()
// deduplicate
// TODO: move it somewhere else
@ -1154,6 +1086,7 @@ func refreshFiltersIfNeccessary() int {
updateCount++
}
}
config.Unlock()
if updateCount > 0 {
err := writeFilterFile()
@ -1237,6 +1170,7 @@ func writeFilterFile() error {
log.Printf("Writing filter file: %s", filterpath)
// TODO: check if file contents have modified
data := []byte{}
config.RLock()
filters := config.Filters
for _, filter := range filters {
if !filter.Enabled {
@ -1249,6 +1183,7 @@ func writeFilterFile() error {
data = append(data, []byte(rule)...)
data = append(data, '\n')
}
config.RUnlock()
err := ioutil.WriteFile(filterpath+".tmp", data, 0644)
if err != nil {
log.Printf("Couldn't write filter file: %s", err)

90
coredns_plugin/coredns_plugin.go
View file

@ -45,19 +45,24 @@ func init() {
})
}
type plug struct {
d *dnsfilter.Dnsfilter
Next plugin.Handler
upstream upstream.Upstream
hosts map[string]net.IP
type plugSettings struct {
SafeBrowsingBlockHost string
ParentalBlockHost string
QueryLogEnabled bool
BlockedTTL uint32 // in seconds, default 3600
}
var defaultPlugin = plug{
type plug struct {
d *dnsfilter.Dnsfilter
Next plugin.Handler
upstream upstream.Upstream
hosts map[string]net.IP
settings plugSettings
sync.RWMutex
}
var defaultPluginSettings = plugSettings{
SafeBrowsingBlockHost: "safebrowsing.block.dns.adguard.com",
ParentalBlockHost: "family.block.dns.adguard.com",
BlockedTTL: 3600, // in seconds
@ -89,10 +94,11 @@ var (
//
func setupPlugin(c *caddy.Controller) (*plug, error) {
// create new Plugin and copy default values
var p = new(plug)
*p = defaultPlugin
p.d = dnsfilter.New()
p.hosts = make(map[string]net.IP)
p := &plug{
settings: defaultPluginSettings,
d: dnsfilter.New(),
hosts: make(map[string]net.IP),
}
filterFileNames := []string{}
for c.Next() {
@ -128,7 +134,7 @@ func setupPlugin(c *caddy.Controller) (*plug, error) {
if len(c.Val()) == 0 {
return nil, c.ArgErr()
}
p.ParentalBlockHost = c.Val()
p.settings.ParentalBlockHost = c.Val()
}
case "blocked_ttl":
if !c.NextArg() {
@ -138,12 +144,9 @@ func setupPlugin(c *caddy.Controller) (*plug, error) {
if err != nil {
return nil, c.ArgErr()
}
p.BlockedTTL = uint32(blockttl)
p.settings.BlockedTTL = uint32(blockttl)
case "querylog":
p.QueryLogEnabled = true
onceQueryLog.Do(func() {
go startQueryLogServer() // TODO: how to handle errors?
})
p.settings.QueryLogEnabled = true
}
}
}
@ -180,7 +183,19 @@ func setupPlugin(c *caddy.Controller) (*plug, error) {
}
}
var err error
log.Printf("Loading top from querylog")
err := loadTopFromFiles()
if err != nil {
log.Printf("Failed to load top from querylog: %s", err)
return nil, err
}
if p.settings.QueryLogEnabled {
onceQueryLog.Do(func() {
go startQueryLogServer() // TODO: how to handle errors?
})
}
p.upstream, err = upstream.New(nil)
if err != nil {
return nil, err
@ -219,6 +234,7 @@ func setup(c *caddy.Controller) error {
return nil
})
c.OnShutdown(p.onShutdown)
c.OnFinalShutdown(p.onFinalShutdown)
return nil
}
@ -245,8 +261,21 @@ func (p *plug) parseEtcHosts(text string) bool {
}
func (p *plug) onShutdown() error {
p.Lock()
p.d.Destroy()
p.d = nil
p.Unlock()
return nil
}
func (p *plug) onFinalShutdown() error {
logBufferLock.Lock()
err := flushToFile(logBuffer)
if err != nil {
log.Printf("failed to flush to file: %s", err)
return err
}
logBufferLock.Unlock()
return nil
}
@ -283,9 +312,11 @@ func doStatsLookup(ch interface{}, doFunc statsFunc, name string, lookupstats *d
}
func (p *plug) doStats(ch interface{}, doFunc statsFunc) {
p.RLock()
stats := p.d.GetStats()
doStatsLookup(ch, doFunc, "safebrowsing", &stats.Safebrowsing)
doStatsLookup(ch, doFunc, "parental", &stats.Parental)
p.RUnlock()
}
// Describe is called by prometheus handler to know stat types
@ -305,7 +336,7 @@ func (p *plug) replaceHostWithValAndReply(ctx context.Context, w dns.ResponseWri
log.Println("Will give", val, "instead of", host)
if addr != nil {
// this is an IP address, return it
result, err := dns.NewRR(fmt.Sprintf("%s %d A %s", host, p.BlockedTTL, val))
result, err := dns.NewRR(fmt.Sprintf("%s %d A %s", host, p.settings.BlockedTTL, val))
if err != nil {
log.Printf("Got error %s\n", err)
return dns.RcodeServerFailure, fmt.Errorf("plugin/dnsfilter: %s", err)
@ -347,7 +378,7 @@ func (p *plug) replaceHostWithValAndReply(ctx context.Context, w dns.ResponseWri
// the only value that is important is TTL in header, other values like refresh, retry, expire and minttl are irrelevant
func (p *plug) genSOA(r *dns.Msg) []dns.RR {
zone := r.Question[0].Name
header := dns.RR_Header{Name: zone, Rrtype: dns.TypeSOA, Ttl: p.BlockedTTL, Class: dns.ClassINET}
header := dns.RR_Header{Name: zone, Rrtype: dns.TypeSOA, Ttl: p.settings.BlockedTTL, Class: dns.ClassINET}
Mbox := "hostmaster."
if zone[0] != '.' {
@ -355,12 +386,12 @@ func (p *plug) genSOA(r *dns.Msg) []dns.RR {
}
Ns := "fake-for-negative-caching.adguard.com."
soa := defaultSOA
soa := *defaultSOA
soa.Hdr = header
soa.Mbox = Mbox
soa.Ns = Ns
soa.Serial = uint32(time.Now().Unix())
return []dns.RR{soa}
soa.Serial = 100500 // faster than uint32(time.Now().Unix())
return []dns.RR{&soa}
}
func (p *plug) writeNXdomain(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
@ -387,13 +418,17 @@ func (p *plug) serveDNSInternal(ctx context.Context, w dns.ResponseWriter, r *dn
for _, question := range r.Question {
host := strings.ToLower(strings.TrimSuffix(question.Name, "."))
// is it a safesearch domain?
p.RLock()
if val, ok := p.d.SafeSearchDomain(host); ok {
rcode, err := p.replaceHostWithValAndReply(ctx, w, r, host, val, question)
if err != nil {
p.RUnlock()
return rcode, dnsfilter.Result{}, err
}
p.RUnlock()
return rcode, dnsfilter.Result{Reason: dnsfilter.FilteredSafeSearch}, err
}
p.RUnlock()
// is it in hosts?
if val, ok := p.hosts[host]; ok {
@ -415,17 +450,20 @@ func (p *plug) serveDNSInternal(ctx context.Context, w dns.ResponseWriter, r *dn
}
// needs to be filtered instead
p.RLock()
result, err := p.d.CheckHost(host)
if err != nil {
log.Printf("plugin/dnsfilter: %s\n", err)
p.RUnlock()
return dns.RcodeServerFailure, dnsfilter.Result{}, fmt.Errorf("plugin/dnsfilter: %s", err)
}
p.RUnlock()
if result.IsFiltered {
switch result.Reason {
case dnsfilter.FilteredSafeBrowsing:
// return cname safebrowsing.block.dns.adguard.com
val := p.SafeBrowsingBlockHost
val := p.settings.SafeBrowsingBlockHost
rcode, err := p.replaceHostWithValAndReply(ctx, w, r, host, val, question)
if err != nil {
return rcode, dnsfilter.Result{}, err
@ -433,7 +471,7 @@ func (p *plug) serveDNSInternal(ctx context.Context, w dns.ResponseWriter, r *dn
return rcode, result, err
case dnsfilter.FilteredParental:
// return cname family.block.dns.adguard.com
val := p.ParentalBlockHost
val := p.settings.ParentalBlockHost
rcode, err := p.replaceHostWithValAndReply(ctx, w, r, host, val, question)
if err != nil {
return rcode, dnsfilter.Result{}, err
@ -524,7 +562,7 @@ func (p *plug) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (
}
// log
if p.QueryLogEnabled {
if p.settings.QueryLogEnabled {
logRequest(r, rrw.Msg, result, time.Since(start), ip)
}
return rcode, err

174
coredns_plugin/querylog.go
View file

@ -4,54 +4,148 @@ import (
"encoding/json"
"fmt"
"log"
"net"
"net/http"
"os"
"path"
"runtime"
"strconv"
"strings"
"sync"
"time"
"github.com/AdguardTeam/AdguardDNS/dnsfilter"
"github.com/coredns/coredns/plugin/pkg/response"
"github.com/miekg/dns"
"github.com/zfjagann/golang-ring"
)
const logBufferCap = 10000
const (
logBufferCap = 5000 // maximum capacity of logBuffer before it's flushed to disk
queryLogTimeLimit = time.Hour * 24 // how far in the past we care about querylogs
queryLogRotationPeriod = time.Hour * 24 // rotate the log every 24 hours
queryLogFileName = "querylog.json" // .gz added during compression
queryLogCacheSize = 1000 // maximum API response for /querylog
queryLogCacheTime = time.Minute // if requested more often than this, give out cached response
queryLogTopSize = 500 // Keep in memory only top N values
queryLogAPIPort = "8618" // 8618 is sha512sum of "querylog" then each byte summed
)
var logBuffer = ring.Ring{}
var (
logBufferLock sync.RWMutex
logBuffer []logEntry
queryLogCache []logEntry
queryLogLock sync.RWMutex
queryLogTime time.Time
)
type logEntry struct {
Question *dns.Msg
Answer *dns.Msg
Question []byte
Answer []byte `json:",omitempty"` // sometimes empty answers happen like binerdunt.top or rev2.globalrootservers.net
Result dnsfilter.Result
Time time.Time
Elapsed time.Duration
IP string
}
func init() {
logBuffer.SetCapacity(logBufferCap)
}
func logRequest(question *dns.Msg, answer *dns.Msg, result dnsfilter.Result, elapsed time.Duration, ip string) {
var q []byte
var a []byte
var err error
if question != nil {
q, err = question.Pack()
if err != nil {
log.Printf("failed to pack question for querylog: %s", err)
return
}
}
if answer != nil {
a, err = answer.Pack()
if err != nil {
log.Printf("failed to pack answer for querylog: %s", err)
return
}
}
now := time.Now()
entry := logEntry{
Question: question,
Answer: answer,
Question: q,
Answer: a,
Result: result,
Time: time.Now(),
Time: now,
Elapsed: elapsed,
IP: ip,
}
logBuffer.Enqueue(entry)
var flushBuffer []logEntry
logBufferLock.Lock()
logBuffer = append(logBuffer, entry)
if len(logBuffer) >= logBufferCap {
flushBuffer = logBuffer
logBuffer = nil
}
logBufferLock.Unlock()
// add it to running top
err = runningTop.addEntry(&entry, now)
if err != nil {
log.Printf("Failed to add entry to running top: %s", err)
// don't do failure, just log
}
// if buffer needs to be flushed to disk, do it now
if len(flushBuffer) > 0 {
// write to file
// do it in separate goroutine -- we are stalling DNS response this whole time
go flushToFile(flushBuffer)
}
return
}
func handler(w http.ResponseWriter, r *http.Request) {
values := logBuffer.Values()
func handleQueryLog(w http.ResponseWriter, r *http.Request) {
now := time.Now()
queryLogLock.RLock()
values := queryLogCache
needRefresh := now.Sub(queryLogTime) >= queryLogCacheTime
queryLogLock.RUnlock()
if needRefresh {
// need to get fresh data
logBufferLock.RLock()
values := logBuffer
logBufferLock.RUnlock()
if len(values) < queryLogCacheSize {
values = appendFromLogFile(values, queryLogCacheSize, queryLogTimeLimit)
}
queryLogLock.Lock()
queryLogCache = values
queryLogTime = now
queryLogLock.Unlock()
}
var data = []map[string]interface{}{}
for _, value := range values {
entry, ok := value.(logEntry)
if !ok {
continue
for _, entry := range values {
var q *dns.Msg
var a *dns.Msg
if len(entry.Question) > 0 {
q = new(dns.Msg)
if err := q.Unpack(entry.Question); err != nil {
// ignore, log and move on
log.Printf("Failed to unpack dns message question: %s", err)
q = nil
}
}
if len(entry.Answer) > 0 {
a = new(dns.Msg)
if err := a.Unpack(entry.Answer); err != nil {
// ignore, log and move on
log.Printf("Failed to unpack dns message question: %s", err)
a = nil
}
}
jsonentry := map[string]interface{}{
@ -60,22 +154,25 @@ func handler(w http.ResponseWriter, r *http.Request) {
"time": entry.Time.Format(time.RFC3339),
"client": entry.IP,
}
question := map[string]interface{}{
"host": strings.ToLower(strings.TrimSuffix(entry.Question.Question[0].Name, ".")),
"type": dns.Type(entry.Question.Question[0].Qtype).String(),
"class": dns.Class(entry.Question.Question[0].Qclass).String(),
if q != nil {
jsonentry["question"] = map[string]interface{}{
"host": strings.ToLower(strings.TrimSuffix(q.Question[0].Name, ".")),
"type": dns.Type(q.Question[0].Qtype).String(),
"class": dns.Class(q.Question[0].Qclass).String(),
}
}
jsonentry["question"] = question
status, _ := response.Typify(entry.Answer, time.Now().UTC())
jsonentry["status"] = status.String()
if a != nil {
status, _ := response.Typify(a, time.Now().UTC())
jsonentry["status"] = status.String()
}
if len(entry.Result.Rule) > 0 {
jsonentry["rule"] = entry.Result.Rule
}
if entry.Answer != nil && len(entry.Answer.Answer) > 0 {
if a != nil && len(a.Answer) > 0 {
var answers = []map[string]interface{}{}
for _, k := range entry.Answer.Answer {
for _, k := range a.Answer {
header := k.Header()
answer := map[string]interface{}{
"type": dns.TypeToString[header.Rrtype],
@ -132,22 +229,33 @@ func handler(w http.ResponseWriter, r *http.Request) {
if err != nil {
errortext := fmt.Sprintf("Unable to write response json: %s", err)
log.Println(errortext)
http.Error(w, errortext, 500)
http.Error(w, errortext, http.StatusInternalServerError)
}
}
func startQueryLogServer() {
listenAddr := "127.0.0.1:8618" // sha512sum of "querylog" then each byte summed
listenAddr := net.JoinHostPort("127.0.0.1", queryLogAPIPort)
http.HandleFunc("/querylog", handler)
go periodicQueryLogRotate()
go periodicHourlyTopRotate()
http.HandleFunc("/querylog", handleQueryLog)
http.HandleFunc("/stats_top", handleStatsTop)
if err := http.ListenAndServe(listenAddr, nil); err != nil {
log.Fatalf("error in ListenAndServe: %s", err)
}
}
func trace(text string) {
func trace(format string, args ...interface{}) {
pc := make([]uintptr, 10) // at least 1 entry needed
runtime.Callers(2, pc)
f := runtime.FuncForPC(pc[0])
log.Printf("%s(): %s\n", f.Name(), text)
var buf strings.Builder
buf.WriteString(fmt.Sprintf("%s(): ", path.Base(f.Name())))
text := fmt.Sprintf(format, args...)
buf.WriteString(text)
if len(text) == 0 || text[len(text)-1] != '\n' {
buf.WriteRune('\n')
}
fmt.Fprint(os.Stderr, buf.String())
}

251
coredns_plugin/querylog_file.go Normal file
View file

@ -0,0 +1,251 @@
package dnsfilter
import (
"bytes"
"compress/gzip"
"encoding/json"
"fmt"
"log"
"os"
"sync"
"time"
"github.com/go-test/deep"
)
var (
fileWriteLock sync.Mutex
)
func flushToFile(buffer []logEntry) error {
if len(buffer) == 0 {
return nil
}
start := time.Now()
var b bytes.Buffer
e := json.NewEncoder(&b)
for _, entry := range buffer {
err := e.Encode(entry)
if err != nil {
log.Printf("Failed to marshal entry: %s", err)
return err
}
}
elapsed := time.Since(start)
log.Printf("%d elements serialized via json in %v: %d kB, %v/entry, %v/entry", len(buffer), elapsed, b.Len()/1024, float64(b.Len())/float64(len(buffer)), elapsed/time.Duration(len(buffer)))
err := checkBuffer(buffer, b)
if err != nil {
log.Printf("failed to check buffer: %s", err)
return err
}
filenamegz := queryLogFileName + ".gz"
var zb bytes.Buffer
zw := gzip.NewWriter(&zb)
zw.Name = queryLogFileName
zw.ModTime = time.Now()
_, err = zw.Write(b.Bytes())
if err != nil {
log.Printf("Couldn't compress to gzip: %s", err)
zw.Close()
return err
}
if err = zw.Close(); err != nil {
log.Printf("Couldn't close gzip writer: %s", err)
return err
}
fileWriteLock.Lock()
defer fileWriteLock.Unlock()
f, err := os.OpenFile(filenamegz, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0644)
if err != nil {
log.Printf("failed to create file \"%s\": %s", filenamegz, err)
return err
}
defer f.Close()
n, err := f.Write(zb.Bytes())
if err != nil {
log.Printf("Couldn't write to file: %s", err)
return err
}
log.Printf("ok \"%s\": %v bytes written", filenamegz, n)
return nil
}
func checkBuffer(buffer []logEntry, b bytes.Buffer) error {
l := len(buffer)
d := json.NewDecoder(&b)
i := 0
for d.More() {
var entry logEntry
err := d.Decode(&entry)
if err != nil {
log.Printf("Failed to decode: %s", err)
return err
}
if diff := deep.Equal(entry, buffer[i]); diff != nil {
log.Printf("decoded buffer differs: %s", diff)
return fmt.Errorf("decoded buffer differs: %s", diff)
}
i++
}
if i != l {
err := fmt.Errorf("check fail: %d vs %d entries", l, i)
log.Print(err)
return err
}
log.Printf("check ok: %d entries", i)
return nil
}
func rotateQueryLog() error {
from := queryLogFileName + ".gz"
to := queryLogFileName + ".gz.1"
if _, err := os.Stat(from); os.IsNotExist(err) {
// do nothing, file doesn't exist
return nil
}
err := os.Rename(from, to)
if err != nil {
log.Printf("Failed to rename querylog: %s", err)
return err
}
log.Printf("Rotated from %s to %s successfully", from, to)
return nil
}
func periodicQueryLogRotate() {
for range time.Tick(queryLogRotationPeriod) {
err := rotateQueryLog()
if err != nil {
log.Printf("Failed to rotate querylog: %s", err)
// do nothing, continue rotating
}
}
}
func genericLoader(onEntry func(entry *logEntry) error, needMore func() bool, timeWindow time.Duration) error {
now := time.Now()
// read from querylog files, try newest file first
files := []string{
queryLogFileName + ".gz",
queryLogFileName + ".gz.1",
}
// read from all files
for _, file := range files {
if !needMore() {
break
}
if _, err := os.Stat(file); os.IsNotExist(err) {
// do nothing, file doesn't exist
continue
}
trace("Opening file %s", file)
f, err := os.Open(file)
if err != nil {
log.Printf("Failed to open file \"%s\": %s", file, err)
// try next file
continue
}
defer f.Close()
trace("Creating gzip reader")
zr, err := gzip.NewReader(f)
if err != nil {
log.Printf("Failed to create gzip reader: %s", err)
continue
}
defer zr.Close()
trace("Creating json decoder")
d := json.NewDecoder(zr)
i := 0
// entries on file are in oldest->newest order
// we want maxLen newest
for d.More() {
if !needMore() {
break
}
var entry logEntry
err := d.Decode(&entry)
if err != nil {
log.Printf("Failed to decode: %s", err)
// next entry can be fine, try more
continue
}
if now.Sub(entry.Time) > timeWindow {
trace("skipping entry")
continue
}
i++
err = onEntry(&entry)
if err != nil {
return err
}
}
log.Printf("file \"%s\": read %d entries", file, i)
}
return nil
}
func appendFromLogFile(values []logEntry, maxLen int, timeWindow time.Duration) []logEntry {
a := []logEntry{}
onEntry := func(entry *logEntry) error {
a = append(a, *entry)
if len(a) > maxLen {
toskip := len(a) - maxLen
a = a[toskip:]
}
return nil
}
needMore := func() bool {
if len(a) >= maxLen {
return false
}
return true
}
err := genericLoader(onEntry, needMore, timeWindow)
if err != nil {
log.Printf("Failed to load entries from querylog: %s", err)
return values
}
// now that we've read all eligible entries, reverse the slice to make it go from newest->oldest
for left, right := 0, len(a)-1; left < right; left, right = left+1, right-1 {
a[left], a[right] = a[right], a[left]
}
// append it to values
values = append(values, a...)
// then cut off of it is bigger than maxLen
if len(values) > maxLen {
values = values[:maxLen]
}
return values
}

359
coredns_plugin/querylog_top.go Normal file
View file

@ -0,0 +1,359 @@
package dnsfilter
import (
"bytes"
"fmt"
"log"
"net/http"
"os"
"path"
"runtime"
"sort"
"strconv"
"strings"
"sync"
"time"
"github.com/bluele/gcache"
"github.com/miekg/dns"
)
// top domains/clients/blocked stats in the last 24 hours
// on start we read the saved stats from the last 24 hours and add them to the stats
// stats are counted using hourly LRU, rotating hourly and keeping last 24 hours
type hourTop struct {
domains gcache.Cache
blocked gcache.Cache
clients gcache.Cache
mutex sync.RWMutex
}
func (top *hourTop) init() {
top.domains = gcache.New(topLRUsize).LRU().Build()
top.blocked = gcache.New(topLRUsize).LRU().Build()
top.clients = gcache.New(topLRUsize).LRU().Build()
}
type dayTop struct {
hours []*hourTop
hoursLock sync.RWMutex // writelock this lock ONLY WHEN rotating or intializing hours!
loaded bool
loadedLock sync.Mutex
}
var runningTop dayTop
func init() {
runningTop.hoursWriteLock()
for i := 0; i < 24; i++ {
hour := hourTop{}
hour.init()
runningTop.hours = append(runningTop.hours, &hour)
}
runningTop.hoursWriteUnlock()
}
func rotateHourlyTop() {
log.Printf("Rotating hourly top")
hour := &hourTop{}
hour.init()
runningTop.hoursWriteLock()
runningTop.hours = append([]*hourTop{hour}, runningTop.hours...)
runningTop.hours = runningTop.hours[:24]
runningTop.hoursWriteUnlock()
}
func periodicHourlyTopRotate() {
t := time.Hour
for range time.Tick(t) {
rotateHourlyTop()
}
}
func (top *hourTop) incrementValue(key string, cache gcache.Cache) error {
top.Lock()
defer top.Unlock()
ivalue, err := cache.Get(key)
if err == gcache.KeyNotFoundError {
// we just set it and we're done
err = cache.Set(key, 1)
if err != nil {
log.Printf("Failed to set hourly top value: %s", err)
return err
}
return nil
}
if err != nil {
log.Printf("gcache encountered an error during get: %s", err)
return err
}
cachedValue, ok := ivalue.(int)
if !ok {
err = fmt.Errorf("SHOULD NOT HAPPEN: gcache has non-int as value: %v", ivalue)
log.Println(err)
return err
}
err = cache.Set(key, cachedValue+1)
if err != nil {
log.Printf("Failed to set hourly top value: %s", err)
return err
}
return nil
}
func (top *hourTop) incrementDomains(key string) error {
return top.incrementValue(key, top.domains)
}
func (top *hourTop) incrementBlocked(key string) error {
return top.incrementValue(key, top.blocked)
}
func (top *hourTop) incrementClients(key string) error {
return top.incrementValue(key, top.clients)
}
// if does not exist -- return 0
func (top *hourTop) lockedGetValue(key string, cache gcache.Cache) (int, error) {
ivalue, err := cache.Get(key)
if err == gcache.KeyNotFoundError {
return 0, nil
}
if err != nil {
log.Printf("gcache encountered an error during get: %s", err)
return 0, err
}
value, ok := ivalue.(int)
if !ok {
err := fmt.Errorf("SHOULD NOT HAPPEN: gcache has non-int as value: %v", ivalue)
log.Println(err)
return 0, err
}
return value, nil
}
func (top *hourTop) lockedGetDomains(key string) (int, error) {
return top.lockedGetValue(key, top.domains)
}
func (top *hourTop) lockedGetBlocked(key string) (int, error) {
return top.lockedGetValue(key, top.blocked)
}
func (top *hourTop) lockedGetClients(key string) (int, error) {
return top.lockedGetValue(key, top.clients)
}
func (r *dayTop) addEntry(entry *logEntry, now time.Time) error {
if len(entry.Question) == 0 {
log.Printf("entry question is absent, skipping")
return nil
}
if entry.Time.After(now) {
log.Printf("t %v vs %v is in the future, ignoring", entry.Time, now)
return nil
}
// figure out which hour bucket it belongs to
hour := int(now.Sub(entry.Time).Hours())
if hour >= 24 {
log.Printf("t %v is >24 hours ago, ignoring", entry.Time)
return nil
}
q := new(dns.Msg)
if err := q.Unpack(entry.Question); err != nil {
log.Printf("failed to unpack dns message question: %s", err)
return err
}
if len(q.Question) != 1 {
log.Printf("malformed dns message, has no questions, skipping")
return nil
}
hostname := strings.ToLower(strings.TrimSuffix(q.Question[0].Name, "."))
// get value, if not set, crate one
runningTop.hoursReadLock()
defer runningTop.hoursReadUnlock()
err := runningTop.hours[hour].incrementDomains(hostname)
if err != nil {
log.Printf("Failed to increment value: %s", err)
return err
}
if entry.Result.IsFiltered {
err := runningTop.hours[hour].incrementBlocked(hostname)
if err != nil {
log.Printf("Failed to increment value: %s", err)
return err
}
}
if len(entry.IP) > 0 {
err := runningTop.hours[hour].incrementClients(entry.IP)
if err != nil {
log.Printf("Failed to increment value: %s", err)
return err
}
}
return nil
}
func loadTopFromFiles() error {
now := time.Now()
runningTop.loadedWriteLock()
defer runningTop.loadedWriteUnlock()
if runningTop.loaded {
return nil
}
onEntry := func(entry *logEntry) error {
err := runningTop.addEntry(entry, now)
if err != nil {
log.Printf("Failed to add entry to running top: %s", err)
return err
}
return nil
}
needMore := func() bool { return true }
err := genericLoader(onEntry, needMore, queryLogTimeLimit)
if err != nil {
log.Printf("Failed to load entries from querylog: %s", err)
return err
}
runningTop.loaded = true
return nil
}
func handleStatsTop(w http.ResponseWriter, r *http.Request) {
domains := map[string]int{}
blocked := map[string]int{}
clients := map[string]int{}
do := func(keys []interface{}, getter func(key string) (int, error), result map[string]int) {
for _, ikey := range keys {
key, ok := ikey.(string)
if !ok {
continue
}
value, err := getter(key)
if err != nil {
log.Printf("Failed to get top domains value for %v: %s", key, err)
return
}
result[key] += value
}
}
runningTop.hoursReadLock()
for hour := 0; hour < 24; hour++ {
runningTop.hours[hour].RLock()
do(runningTop.hours[hour].domains.Keys(), runningTop.hours[hour].lockedGetDomains, domains)
do(runningTop.hours[hour].blocked.Keys(), runningTop.hours[hour].lockedGetBlocked, blocked)
do(runningTop.hours[hour].clients.Keys(), runningTop.hours[hour].lockedGetClients, clients)
runningTop.hours[hour].RUnlock()
}
runningTop.hoursReadUnlock()
// use manual json marshalling because we want maps to be sorted by value
json := bytes.Buffer{}
json.WriteString("{\n")
gen := func(json *bytes.Buffer, name string, top map[string]int, addComma bool) {
json.WriteString(" ")
json.WriteString(fmt.Sprintf("%q", name))
json.WriteString(": {\n")
sorted := sortByValue(top)
// no more than 50 entries
if len(sorted) > 50 {
sorted = sorted[:50]
}
for i, key := range sorted {
json.WriteString(" ")
json.WriteString(fmt.Sprintf("%q", key))
json.WriteString(": ")
json.WriteString(strconv.Itoa(top[key]))
if i+1 != len(sorted) {
json.WriteByte(',')
}
json.WriteByte('\n')
}
json.WriteString(" }")
if addComma {
json.WriteByte(',')
}
json.WriteByte('\n')
}
gen(&json, "top_queried_domains", domains, true)
gen(&json, "top_blocked_domains", blocked, true)
gen(&json, "top_clients", clients, true)
json.WriteString(" \"stats_period\": \"24 hours\"\n")
json.WriteString("}\n")
w.Header().Set("Content-Type", "application/json")
_, err := w.Write(json.Bytes())
if err != nil {
errortext := fmt.Sprintf("Couldn't write body: %s", err)
log.Println(errortext)
http.Error(w, errortext, http.StatusInternalServerError)
}
}
// helper function for querylog API
func sortByValue(m map[string]int) []string {
type kv struct {
k string
v int
}
var ss []kv
for k, v := range m {
ss = append(ss, kv{k, v})
}
sort.Slice(ss, func(l, r int) bool {
return ss[l].v > ss[r].v
})
sorted := []string{}
for _, v := range ss {
sorted = append(sorted, v.k)
}
return sorted
}
func (d *dayTop) hoursWriteLock() { tracelock(); d.hoursLock.Lock() }
func (d *dayTop) hoursWriteUnlock() { tracelock(); d.hoursLock.Unlock() }
func (d *dayTop) hoursReadLock() { tracelock(); d.hoursLock.RLock() }
func (d *dayTop) hoursReadUnlock() { tracelock(); d.hoursLock.RUnlock() }
func (d *dayTop) loadedWriteLock() { tracelock(); d.loadedLock.Lock() }
func (d *dayTop) loadedWriteUnlock() { tracelock(); d.loadedLock.Unlock() }
func (h *hourTop) Lock() { tracelock(); h.mutex.Lock() }
func (h *hourTop) RLock() { tracelock(); h.mutex.RLock() }
func (h *hourTop) RUnlock() { tracelock(); h.mutex.RUnlock() }
func (h *hourTop) Unlock() { tracelock(); h.mutex.Unlock() }
func tracelock() {
if false { // not commented out to make code checked during compilation
pc := make([]uintptr, 10) // at least 1 entry needed
runtime.Callers(2, pc)
f := path.Base(runtime.FuncForPC(pc[1]).Name())
lockf := path.Base(runtime.FuncForPC(pc[0]).Name())
fmt.Fprintf(os.Stderr, "%s(): %s\n", f, lockf)
}
}

6
dnsfilter/dnsfilter.go
View file

@ -136,9 +136,9 @@ var (
// Result holds state of hostname check
type Result struct {
IsFiltered bool
Reason Reason
Rule string
IsFiltered bool `json:",omitempty"`
Reason Reason `json:",omitempty"`
Rule string `json:",omitempty"`
}
// Matched can be used to see if any match at all was found, no matter filtered or not

85
helpers.go
View file

@ -9,9 +9,7 @@ import (
"os"
"path"
"runtime"
"sort"
"strings"
"time"
)
func clamp(value, low, high int) int {
@ -133,89 +131,6 @@ func generateMapFromStats(stats *periodicStats, start int, end int) map[string]i
return result
}
// -------------------------------------
// helper functions for querylog parsing
// -------------------------------------
func sortByValue(m map[string]int) []string {
type kv struct {
k string
v int
}
var ss []kv
for k, v := range m {
ss = append(ss, kv{k, v})
}
sort.Slice(ss, func(l, r int) bool {
return ss[l].v > ss[r].v
})
sorted := []string{}
for _, v := range ss {
sorted = append(sorted, v.k)
}
return sorted
}
func getHost(entry map[string]interface{}) string {
q, ok := entry["question"]
if !ok {
return ""
}
question, ok := q.(map[string]interface{})
if !ok {
return ""
}
h, ok := question["host"]
if !ok {
return ""
}
host, ok := h.(string)
if !ok {
return ""
}
return host
}
func getReason(entry map[string]interface{}) string {
r, ok := entry["reason"]
if !ok {
return ""
}
reason, ok := r.(string)
if !ok {
return ""
}
return reason
}
func getClient(entry map[string]interface{}) string {
c, ok := entry["client"]
if !ok {
return ""
}
client, ok := c.(string)
if !ok {
return ""
}
return client
}
func getTime(entry map[string]interface{}) time.Time {
t, ok := entry["time"]
if !ok {
return time.Time{}
}
tstr, ok := t.(string)
if !ok {
return time.Time{}
}
value, err := time.Parse(time.RFC3339, tstr)
if err != nil {
return time.Time{}
}
return value
}
// -------------------------------------------------
// helper functions for parsing parameters from body
// -------------------------------------------------

22
stats.go
View file

@ -12,6 +12,7 @@ import (
"path/filepath"
"strconv"
"strings"
"sync"
"syscall"
"time"
)
@ -57,19 +58,27 @@ type stats struct {
PerDay periodicStats
LastSeen statsEntry
sync.RWMutex
}
var statistics stats
func initPeriodicStats(periodic *periodicStats) {
*periodic = periodicStats{}
periodic.Entries = statsEntries{}
periodic.LastRotate = time.Time{}
}
func init() {
purgeStats()
}
func purgeStats() {
statistics.Lock()
initPeriodicStats(&statistics.PerSecond)
initPeriodicStats(&statistics.PerMinute)
initPeriodicStats(&statistics.PerHour)
initPeriodicStats(&statistics.PerDay)
statistics.Unlock()
}
func runStatsCollectors() {
@ -98,6 +107,9 @@ func isConnRefused(err error) bool {
}
func statsRotate(periodic *periodicStats, now time.Time, rotations int64) {
if rotations > statsHistoryElements {
rotations = statsHistoryElements
}
// calculate how many times we should rotate
for r := int64(0); r < rotations; r++ {
for key, values := range periodic.Entries {
@ -116,10 +128,12 @@ func statsRotate(periodic *periodicStats, now time.Time, rotations int64) {
// called every second, accumulates stats for each second, minute, hour and day
func collectStats() {
now := time.Now()
statistics.Lock()
statsRotate(&statistics.PerSecond, now, int64(now.Sub(statistics.PerSecond.LastRotate)/time.Second))
statsRotate(&statistics.PerMinute, now, int64(now.Sub(statistics.PerMinute.LastRotate)/time.Minute))
statsRotate(&statistics.PerHour, now, int64(now.Sub(statistics.PerHour.LastRotate)/time.Hour))
statsRotate(&statistics.PerDay, now, int64(now.Sub(statistics.PerDay.LastRotate)/time.Hour/24))
statistics.Unlock()
// grab HTTP from prometheus
resp, err := client.Get("http://127.0.0.1:9153/metrics")
@ -186,6 +200,7 @@ func collectStats() {
}
// calculate delta
statistics.Lock()
delta := calcDelta(entry, statistics.LastSeen)
// apply delta to second/minute/hour/day
@ -196,6 +211,7 @@ func collectStats() {
// save last seen
statistics.LastSeen = entry
statistics.Unlock()
}
func calcDelta(current, seen statsEntry) statsEntry {
@ -240,7 +256,9 @@ func loadStats() error {
func writeStats() error {
statsFile := filepath.Join(config.ourBinaryDir, "stats.json")
log.Printf("Writing JSON file: %s", statsFile)
json, err := json.MarshalIndent(statistics, "", " ")
statistics.RLock()
json, err := json.MarshalIndent(&statistics, "", " ")
statistics.RUnlock()
if err != nil {
log.Printf("Couldn't generate JSON: %s", err)
return err